Thomas holliday



ihvi'rnn STATES PATENT OFF CE.

THOMAS HOLLIDAY', OF HUDDERSF-IELD, COUNTY OF YORK, ENGLAND.

DYEING TEXTILE ANIMAL FIBERS.

SPECIFICATION forming part of Letters Patent No. 355,934, dated January 11, 1887.

Application filed June 2, 1886., Serial No. 203,931. (No specimens.)

To aZZ whom it may concern:

Be it known that I, THOMAS HOLLIDAY, of the firm of Read, Holliday 8t Sons, of Huddersfield, in the county of York, England, manufacturing chemist, a subject of the Queen of Great Britain, have invented certain new and useful Improvements in Dyeing Wool and other Textile Animal Fibers; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

These improvements relate to the dyeing of textile animal fibers in a raw state or manufactured with the product of the oxidation of alpha-naphthol by chromic acid, by acting on the alpha-naphthol with chromic acid in the presence of the fiber. For instance, the fiber (say wool) is steeped in a solution in water, which may be cold, containing about one-half per cent. of bichromate of potash, acidulated with sulphuric acid. After steeping about one half an hour it can be taken out, washed, and dyed in hot water containing alpha-naphthol, in proportion of about five per cent. of the weight of the wool, when the wool will be found to be dyed a color which will also serve as a good bottom for other well-known coloring-matters, many of whichsuch as extract of indigo-can be added to the naphthol bath in the process of dyeing and many varieties of mixedshadesobtained. Itwillbefound,among others, a good bottom for claret-s, maroons, and olive-greens.

In the dyeing of lighter or darker shades the quantity oi'the matters in relation to each other will be varied. 7

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, 40 I declare that what I claim is- The dyeing of textile animal fibers with the product of the oxidation of alpha-naphthol by chromic acid, by acting on the alpha-naphthol with chromic acid in the presence of the fiber.

In testimony whereof I, the said THOMAS HOLLIDAY, have hereunto set my hand this 16th day of March, 1886.

THOMAS HOLLIDAY.

Witnesses:

ALFRED S. BRooKEs, ALFRED FOWLER HASKELL. 

